Reading the TQI table

This page is for quality control managers, Authorised Examiners and testers who want to understand every part of the TQI table: the columns, the rows, the colours and the arrows.

How is the TQI table laid out?

The table has one row per TQI measure and one column per person or average.

• Category (first column) names the measure.
• National is the DVSA national figure for that measure and vehicle group.
• Each following column is a tester, shown by their DVSA user ID. Under the ID you see the number of tests that tester did, for example 42 tests.
• A column headed Site avg is the station's own average.
• When you view several stations, a header row above the columns groups them under each station number.

The table scrolls sideways inside its own box. The first column and header stay in view. Above the table a note says "Rows are the share of tests, in %, unless a unit is shown."

What do the cell colours mean?

Each tester cell is compared with the national figure for its row and shown in one of three states.

The legend under the table repeats this: "Watch (30%+ from national)" and "Outlier (60%+ from national; small samples stop at Watch)". The distance is measured as a proportion of the national figure, so a tester at 24% against national 15% is 60% away.

Colour is never the only signal. Cells above national show ▲, cells below show ▼, and within-range cells show no arrow. The details of the rules are in National comparison and outliers.

What does "small sample" mean?

A column is flagged small sample when the tester did fewer than 30 tests in the month for that vehicle group. A small sample can swing a rate a long way from chance alone, so MOTLogs never marks a small-sample figure as an Outlier. It stops at Watch. The site average column is never flagged.

Which rows are not coloured?

Two kinds of row are shown without colour or arrows, because a bigger number is not better or worse:

• Tests done (a count that depends on how busy the tester was).
• Average vehicle age.

The National cell for those rows shows –. Cells with no figure show – and read "No data" to screen readers.

What units are used?

Most rows are a percentage of tests. Two rows show a unit in the label:

Figures show one decimal place if any figure on the page has a decimal, otherwise none.

What does the "What stands out" note say?

Below the table a note called What stands out names the one tester who is furthest from national on test time and fail rate, or says "Nothing stands out against national this month." It ends "A DVSA examiner would ask about this first. It is a prompt to look, not a verdict." See National comparison and outliers.

Reference